Get rid of unnecessary cast of FlexfecReceiveStreamImpl to FlexfecReceiveStream

webrtc/call/flexfec_receive_stream.h

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_CALL_FLEXFEC_RECEIVE_STREAM_H_
 #define WEBRTC_CALL_FLEXFEC_RECEIVE_STREAM_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "webrtc/api/call/transport.h"
 #include "webrtc/config.h"
 
 namespace webrtc {
 
 class FlexfecReceiveStream {
  public:
+  virtual ~FlexfecReceiveStream() = default;
+
   struct Stats {
     std::string ToString(int64_t time_ms) const;
 
     // TODO(brandtr): Add appropriate stats here.
     int flexfec_bitrate_bps;
   };
 
   struct Config {
     explicit Config(Transport* rtcp_send_transport)
         : rtcp_send_transport(rtcp_send_transport) {
@@ skipping 39 matching lines @@
 
   // Starts stream activity.
   // When a stream is active, it can receive and process packets.
   virtual void Start() = 0;
   // Stops stream activity.
   // When a stream is stopped, it can't receive nor process packets.
   virtual void Stop() = 0;
 
   virtual Stats GetStats() const = 0;
 
- protected:
-  virtual ~FlexfecReceiveStream() = default;
+  virtual const Config& GetConfig() const = 0;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_CALL_FLEXFEC_RECEIVE_STREAM_H_